PLANO (CBSDFW.COM) – A Plano man was arrested on Thursday for running an unlicensed dental practice in several makeshift offices inside his home.

Police told KRLD 1080 that the man, 63-year-old Jose Santiago Delao, advertised through word of mouth and targeted those who did not have dental insurance. Investigators were initially tipped off to Delao’s illegal business by a patient who felt he had improper work done on his teeth.